<template>
  <div id="app" :data-theme="this.$store.state.theme">
    <div class="appContent">
      <transition :name="transitionName">
        <router-view></router-view>
      </transition>
    </div>
  </div>
</template>
<script>
export default {
  name: 'app',
  data() {
    return {
      transitionName: '',
    }
  },
  methods: {},
  watch: {
    $route(to, from) {
      // 如果to索引大于from索引,判断为前进状态,反之则为后退状态
      if (to.meta.index > from.meta.index) {
        // 设置动画名称
        this.transitionName = 'slide-left'
      } else {
        this.transitionName = 'slide-right'
      }
    },
  },
}
</script>
<style lang="scss">
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
}

.appContent {
  height: 100vh;
  @include font_color('fontColor');
  @include font_size('baseFontSize');
}

.slide-right-enter-active,
.slide-right-leave-active,
.slide-left-enter-active,
.slide-left-leave-active {
  will-change: transform;
  transition: all 500ms;
  position: absolute;
}
.slide-right-enter {
  opacity: 0;
  transform: translate3d(-100%, 0, 0);
}
.slide-right-leave-active {
  opacity: 0;
  transform: translate3d(100%, 0, 0);
}
.slide-left-enter {
  opacity: 1;
  transform: translate3d(100%, 0, 0);
}
.slide-left-leave-active {
  opacity: 0;
  transform: translate3d(-100%, 0, 0);
}
</style>
